novacut-gtk crashed with TypeError in call_blocking(): an integer is required (got type NoneType)

This may be related to another bug, I previously reported (1242166), but other than that I am unsure of what additional information, I can provide.

ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: novacut 14.06.0~bzr365~ubuntu14.04.1 [origin: LP-PPA-novacut-daily]
ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
Uname: Linux 3.13.0-24-generic i686
NonfreeKernelModules: wl
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: i386
CrashDB: {'impl': 'launchpad', 'project': 'novacut'}
CurrentDesktop: Unity
Date: Sat Jun 28 12:13:43 2014
ExecutablePath: /usr/bin/novacut-gtk
InterpreterPath: /usr/bin/python3.4
PackageArchitecture: all
ProcCmdline: /usr/bin/python3 /usr/bin/novacut-gtk
PythonArgs: ['/usr/bin/novacut-gtk']
SourcePackage: novacut
Title: novacut-gtk crashed with TypeError in call_blocking(): an integer is required (got type NoneType)
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip disk lpadmin plugdev sambashare sudo